I did a google/wikipedia search once and it said that its founder fell on some hard times in the late 70s and passed.
it was an interesting read.
HTH
-s
Nonono. You are talking about Hans Peter Koepchen, who was the founder of Koepchen BMW tuning 'company'. At the end of 1973 because of the oil crisis lots of tuner went out of business, including Koepchen. Then he has hard times, alcohol drinking problems, etc. H P Koepchen died in 1999.
On ther other had, GS name came from Gerhard Schneider, at the last activity I heard about his tuning company / race team was a GS owned/prepared ? BMW M1 from the end of 70's. Also I had seen a brochure from this period.
As I know he still lives in Germany. (according some pdf about his life, from a tyre company website).
B. Bovensiepen still lives, one of Schnitzer brothers also lives, and both Hartge brothers live, too.